start porting model specs into heromodels

heromodels/examples/calendar_rhai/calendar.rhai

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+// Get the database instance
+let db = get_db();
+
+// Create a new calendar
+let calendar = calendar__builder(1);
+calendar.name = "My First Calendar";
+set_description(calendar, "A calendar for testing Rhai integration");
+
+print("Created calendar: " + calendar.name);
+
+// Save the calendar to the database
+set_calendar(db, calendar);
+print("Calendar saved to database");
+
+// Check if calendar exists and retrieve it
+if calendar_exists(db, 1) {
+    let retrieved_calendar = get_calendar_by_id(db, 1);
+    print("Retrieved calendar: " + retrieved_calendar.name);
+    let desc = get_description(retrieved_calendar);
+    if desc != "" {
+        print("Description: " + desc);
+    } else {
+        print("No description available");
+    }
+} else {
+    print("Failed to retrieve calendar with ID 1");
+}
+
+// Create another calendar
+let calendar2 = calendar__builder(2);
+calendar2.name = "My Second Calendar";
+set_description(calendar2, "Another calendar for testing");
+
+set_calendar(db, calendar2);
+print("Second calendar saved");
+
+// Get all calendars
+let all_calendars = get_all_calendars(db);
+print("Total calendars: " + all_calendars.len());
+
+for calendar in all_calendars {
+    print("Calendar ID: " + get_id(calendar) + ", Name: " + calendar.name);
+}
+
+// Delete a calendar
+delete_calendar_by_id(db, 1);
+print("Deleted calendar with ID 1");
+
+// Verify deletion
+if !calendar_exists(db, 1) {
+    print("Calendar with ID 1 was successfully deleted");
+} else {
+    print("Failed to delete calendar with ID 1");
+}
+
+// Count remaining calendars
+let remaining_calendars = get_all_calendars(db);
+print("Remaining calendars: " + remaining_calendars.len());